Mobile app, sync & team
Your whole business on your phone — in sync with your PC
The Android app is the full app, not a viewer. Bill, collect, produce and check profit from anywhere; your PC sees it moments later.
In one line
How does a billing app stay in sync with the PC?
SMI Books keeps one book per business in the cloud and a full copy on every device. You can work offline; changes upload when the internet returns, and two devices billing at the same moment never overwrite each other.
Sync
One book on every device
Sign in with the same account on the counter PC, the owner's phone and the accountant's laptop. Your plan decides how many work together.
- Works offline, syncs when back online
- Two devices billing at once — nothing lost
- Bill numbers never repeat across devices
- Stock merges, never overwritten
Team
Everyone with the right access
Invite staff and give each exactly the screens and actions they need — from a cashier who only bills to an accountant who sees the books.
- Owner, Admin, Accountant, Sales, Purchase, Cashier, Viewer
- Switch screens and actions on or off for each role
- Your plan sets how many devices work together
- Activity log of who did what
Devices
How many devices work together
Every plan runs the same book on Windows PCs, Android phones and tablets at the same time. Pick a plan by how many of them you use together.
What you get
Everything in one place
Full Android app
Every feature, not just a viewer.
Offline
Bill without internet.
Real-time sync
PC and phone moments apart.
Team roles
Seven roles, per-screen permissions.
Drive backup
Scheduled backup to your own Google Drive.
Private
Each business kept separate by security rules.
Questions
Frequently asked
Can I use it on my PC and my phone together?
Yes. Sign in with the same account on every device. How many devices can work together depends on your plan — from 2 on Retail to 11 on Factory.
Does SMI Books work without internet?
Yes. Billing, stock, production and reports all work offline. Whatever you save uploads by itself when the internet is back, and your other devices catch up.
Is my data safe? Who can see it?
Only you and the team members you invite. Each business is kept completely separate by server-side security rules, and you can back up to your own Google Drive at any time.
Start today
Run your whole business from one book — free for 30 days
Install on your Windows PC and your Android phone, sign in once, and bill, stock, produce and account from anywhere. No card needed.